A rapid screening by liquid chromatography/mass spectrometry and fast-atom bombardment tandem mass spectrometry of phenolic constituents with radical scavenging activity, from Krameria triandra roots
✍ Scribed by R. Maffei Facino; M. Carini; G. Aldini; L. De Angelis
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 296 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0951-4198
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✦ Synopsis
Liquid chromatography/mass spectrometry (particle beam interface, electron impact ionization), fast-atom bombardment mass spectrometry (FAB-MS) (negative-ion mode) and FAB-tandem mass spectrometry (MS/MS) techniques were applied for the rapid detection/characterization of low-to-intermediate molecular weight polyphenol constituents of Krameria triandra roots with radical scavenging activity, this determined in a well established membrane model of lipid peroxidation (phosphatidylcholine liposomes). LC/MS analysis of the more lipophilic fractions of the drug (antioxidant activity: IC 50 , the concentration which gives 50% inhibition, 5.8 µg/mL petrol extract; IC 50 3.7 µg/mL chloroform extract) evidences at least 9 components belonging to the class of lignans; FAB-MS/MS analysis of the butylacetate extract (IC 50 = 0.23 µg/mL) caffeoyl esters, catechin-glucosides, dimeric procyanidines and their corresponding phenylpropanoyd derivatives.